Combined form and reenforcement for cement



July 15 1924.

H. J. KAR STENS ET AL COMBINED FORM AND REENFORCEMENT FOR CEMENT Filed Dec. 51. 1921 VE/VT 1/ MJ J/MM I; Patented July 15, 1924.

UNITED STATES r 1,501,850 PATENT OFFICE.'

HUGQ JACOB KARS'IENS, OF WHEATON, AND HARRY HUGH KARSTENS, OF CHICAGO,

' ILLINOIS.

COMBINED FORM AND REENFORCEMENT FOR CEMENT.

Application filed December 31, 1921.

T0 {ZZZ whom it may concern:

Be it known that we, HUGO JAooB KARs- TENS and HARRY HUGH KARsTENs, both citizens of the United States, and residing, respectively, at Wheaton, in the county of Du Page and State of Illinois, and at Chicago, I

in the county of Cook and State of Illinois, have invented certain new and useful Im provements in Combined Forms and Reenforcements for Cement, of which the following is a specification.

This invention relates primarily to forms intended for use in the making of tubular cement sections which are intended to be used for conduits, columns, and piping or the like, although the construction to be de scribed is adapted for use in making other cement or plastic structures. In the making of tubular cement sections or hollow blocks it is customary to provide a collapsible inner core which is set up during the pouring operation and thereafter collapsed and removed from the completed cement section or block. This requires the use of forms of rather complicated structure and requires considerable time in the removal and reassembling of the core for repeated use.

The object of the present invention is to reduce the expense and time required in such operations, by providing a core which is intended to remain in the completed block or tube, and which will be of such cheap construction that economy will be effected in allowing the core to remain in the structure as compared with the time and expense in volved in removing and reassembling the core for repeated use. The core structure, however, is applicable to use as a mold in the formation of the outer surface of the intended cement or other plastic structure, and it will therefore be understood that the invention is not limited strictly to the formation of cores but that it has a wider ap plication.

In the drawings:

Figure 1 is a side elevation of a tubular cement block adapted for use as a column, conduit or the like;

Fig. 2 is a cross section of the same; and

Fig. 3 is a sectional view of a solid block showing the form of the present invention as used for the molding of exterior surfaces.

The form consists of a supporting mesh A which is preferably formed of relatively close woven metallic screening or expanded Serial No. 526,282.

metal, and bent to cylindrical or other shape corresponding to the intended configuration of the inner wall of the block, tube, or other structure to be poured. The inner supporting mesh is sufliciently firm and rigid to withstand the pressure of the poured cement or like material without collapsing, and such supporting mesh constitutes a backing for a covering B of burlap or similar coarse woven fabric, which is sufiiciently close to prevent passage of the cement therethrough while in liquid or plastic condition.

The inner form thus constructed is combined with a reinforcing mesh C of 'rela-' tively heavy gauge, which is intended to be imbedded within the cement structure, and which is held in spaced relation'to the inner form by means of suitably formed spacers D so that the parts will be accurately spaced during the pouring operation. If desired, the inner form maybe duplicated on the outside of the hollow structure, as indicated in Fig. 3, in which case, of course, the supporting fine mesh wire fabric will occupy the exterior position. Although the invention possesses its principal advantages in use as an inner core, the same construction can be used solely for an outer core or in combination with an inner core of like construction.

With the form or forms set up as inclicated, the cement is poured into the in tended space and will flow freely through the interstices of the reinforcing mesh, but will be held against escape, to the interior or exterior as the case may be, by the fabric covering 13, the meshes of which are suf ficiently close together to prevent the escape of cement, although allowing any ex cess of water to freely flow through the meshes and also furnishing free ingress for air to assist in the drying out of the cement. It will be found, however, that a slight amount of cement will pass through the fabric covering, so that the supporting mesh will be more or less firmly engaged by the cement and be practically imbeddecl therein. At the same time, the form as a whole is sufficiently impervious to the passage of the fluid cement to give an accurate configuration to the block or other cement struc ture without the use of additional reenforcment.

The forms of the present invention can be easily and quickly cut from mesh of the and cheaper manner h L J 0t constructing cement structures than by the use W lll/ll/ll/t dill ll Ill/it'll [ll/52 t c acct/rate l l v iv to wiliislanti lile blll'llllli h l p terials. such plaster or the like, and that the term cement is intended to cover other materials having properties similar to cement.

Tl' e claim: 1. A. structure consisting of a cementitious ho ly. reenforcingmesh embedded Within the body and of relatively heavy gauge to atliord reenforcement to the body. a metallic supporting. mesh of relatively light {range constituting a facing for the body, and a fabric covering of relatively close. mesh bearing; against the supporting mesh and interposed between the supporting mesh and the body, substantially as described.

2. A structure consisting of a tubular and {IT 1 v (any: pp ilgjeuded Within the b d 7 a (Zing for fag mes/1 constitutin an maelr3 till l l l i l illl lilllil ltlllillllltlll h L covering of still finer mesh bearing against the supporting mesh and interposed between the supporting mesh and the body, sub stantially as described.

3. A core form for the pouring of plastic materials, comprising a relatively light and close tubular supporting metallic mesh of a gauge adapting it to be readily bent to the desired configuration and possessing a suf ficient rigidity to Withstand a pouring pressure, a covering of relatively light fabric laid against the supporting mesa and sub ficiently close Woven to be practically imvervious to the passage of the plastic material, and a relatively heavy and open rnetallic reentorcing mesh held in spaced relation to the supporting mesh and in position to be embedded Within the completed structure. the fabric being interposed between the supporting mesh and the reentorcing' mesh, substantially as described.

HUGO JACOB KAI S. HARRY HUGH KARSTENS.

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